Bring your non-throwhand pointer
finger in towards your body pushing, it into the string just above
the yo-yo. This causes the yo-yo to land onto the string.

Once again bring your non-throwhand in for a
second time and land the yo-yo on the string again so it should now be
on there doubled up.

Simply drop your throwhand pointer finger and
pull the string in towards yourself. This should cause the yo-yo to unwrap
itself and you will end up in what looks similar to a trapeze. Return
the yo-yo to hand.